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SKU
156755
API 527A 500 Series Compressor/Limiter
500 series compressor/limiter with feed-forward or feed-back compression, hard or soft knee compression, and patented THRUST switch for frequency-dependent sidechain control
Product Description
The API 527A Compressor/Limiter takes its place alongside the family of API VCA based compressors, including the 225L compressor and 529, 2500, and 2500+ stereo bus compressors. Anyone familiar with these units will immediately be at home with the 527A.
Features common to the line include “feed-forward” (NEW) and “feed-back” (OLD) gain reduction methods selectable on the front panel, provide a choice of “that old way” or “the new way” of compression, for the highest level of flexibility in signal gain control. The “old way” or feed-back method is what most of the classic compressors used for the gain control circuit. The “new way” gain reduction is more typical of the newer VCA type compressors that rely on RMS detectors for the gain control voltage.
There is a “SOFT”/”HARD” knee switch for an “over-easy” type compression resulting in a very natural, uncompressed sound or a typical sharp knee type that lends itself to a much more severe limiting effect.
The patented THRUST function can be switched in and out via the front panel as well, applying a filter before the RMS detector circuit that preserves that punchy bottom end.
Two or more 527A Compressor/Limiters can be linked together via a DC link allowing multiple units to be combined for stereo and multichannel applications.
The output level remains fairly constant regardless of the threshold or ratio control, much like the “more/less” Ceiling control on the API 525 Compressor. This allows for live adjustments without any noticeable gain changes in the program level.
The 527A Compressor/Limiter makes use of the 2510 and 2520 discrete op-amps and exhibits the reliability, long life, and signature sound which are characteristic of API products.
FEATURES:
- Feed-forward or feed-back compression
- Hard or soft knee compression
- Patented THRUST switch for frequency-dependent sidechain control
- Continuously variable, 31 position detented THRESHOLD control
- Continuously variable, 31 position detented RATIO control
- Continuously variable, 31 position detented ATTACK and RELEASE controls
- Continuously variable, 31 position detented OUT (output) level control
- 10-segment gain reduction/VU meter (GR/Output) Overload LED
- IN switch with soft and hard relay bypass
- Audio circuit uses the 2510 and 2520 discrete op-amps
Product Specifications
| Condition | New |
|---|---|
| Channels | Single-Channel |
| Chassis | Module |
| Module Type | 500 Series |
| Module Slot Count | 1 Slot |
Related Blog Posts
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Upgraded API 527A Brings Improved Metering And Hard Bypass Switch
05.27.2021Read More
After many successful years producing the 527 compressor/limiter, API Audio is proud to announce the new 527A ($1135.25). The original 527 quickly gained a great reputation for its versatility, so API has built upon it by adding improvements to make it even more convenient to use. API retained the circuit of the former 527, so you’ll feel right at home using the new 527A.
The API 527A Compressor/Limiter is a VCA-based compressor with variable gain reduction methods for switching between “feed-forward” and “feed-back” styles of compression. Users who are familiar with the 225L, 529, 2500, or 2500+ will easily recognize the NEW / OLD gain reduction switch on the front panel. The 527A features an improved LED gain reduction meter and a hard bypass switch for enhanced usability.
Engineers fell in love with the 527’s flexible signal gain control. API designed the 527A with the same control features for adjusting the compressor’s gain reduction behavior. For classic “feed-back” performance, switch to OLD. The NEW setting enables a “feed-forward” gain reduction style that relies on RMS detectors for the gain control voltage, which is typical for newer VCA-type compressors. Compressed signals can be adjusted via continuously variable threshold, ratio, attack/release, and output level controls. Switchable SOFT / HARD knee settings further modify the compressor’s character to toggle between natural or sharp responses. API also included a patented THRUST® function that inserts a filter before the RMS detector circuit. The THRUST switch allows the compressor to preserve the articulate low-end. Versatility is matched by efficiency. The consistent output level makes live adjustments possible without perceivable gain changes in the program level. Like the original 527, this version also makes use of 2510 and 2520 discrete op-amps and can be combined via DC link for multichannel applications.
If you're interested in purchasing the API 527A or any gear from API Audio, we're here to help! Please contact a Vintage King Audio Consultant via email or by phone at 866.644.0160.
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